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2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)最新文献

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Compensated 3-dB lange directional coupler in suspended microstrip technique 悬浮微带技术中补偿3db方向耦合器
K. Janisz, R. Smolarz, A. Rydosz, K. Wincza, S. Gruszczynski
An investigation on the design of Lange couplers in suspended microstrip technique is presented. The chosen realization technique allows for minimization of total losses in the coupler. The theoretical analysis shows that the Lange couplers can be compensated with the proper selection of dielectric stratification of the substrate, and by the proposed compensation both isolation and impedance match of the coupler can be enhanced. The presented theoretical investigation has been supported by measurements of a 3-dB directional coupler exhibiting good electrical properties and low total losses.
对悬浮微带技术中兰格耦合器的设计进行了研究。所选择的实现技术可以使耦合器的总损耗最小化。理论分析表明,适当选择基片的介电层可以对兰格耦合器进行补偿,从而提高耦合器的隔离度和阻抗匹配度。所提出的理论研究得到了一个具有良好电性能和低总损耗的3db定向耦合器的测量结果的支持。
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引用次数: 5
A study on calibration compensation and perturbation of electromagnetic probes 电磁探头标定补偿与摄动研究
W. Liu, Zhaowen Yan, Wenjing Zhao
The accuracy of electromagnetic probe coefficient is fundamental to the precision of near-field scanning value. In the traditional, the method to determine the coefficient by using microstrip line is based on the perfect near-field distribution provided by the line with the matching terminal. However, the actual calibration result error is a linear superposition of the loss of the microstrip trace and the perturbation introduced by the probe. Independently compensating the microstrip line loss is the key to calculate the accurate probe calibration coefficient. The probe perturbation exist simultaneously in both the calibration and testing process. The weight of the perturbation influence factor is the precondition of correcting the near-field scanning data and improving the performance of probe.
电磁探头系数的精度是近场扫描值精度的基础。在传统方法中,利用微带线确定系数的方法是基于具有匹配终端的线路所提供的完美近场分布。然而,实际的校准结果误差是微带迹线损耗和探针引入的微扰的线性叠加。独立补偿微带线损是精确计算探针标定系数的关键。探针摄动在标定和测试过程中同时存在。摄动影响因子的权重是校正近场扫描数据和提高探头性能的前提。
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引用次数: 1
A study of electromagnetic scattering from two-dimensional rough sea surfaces with a ship-induced wake 船舶诱导尾流的二维粗糙海面电磁散射研究
R. Wu, Pengju Yang, Ye Zhao, X. Ren, Yuqiang Zhang, W. Tian
In this paper, electromagnetic scattering from rough sea surfaces with a ship-induced induced Kelvin wake is investigated by utilizing the polarimetirc scattering model of second-order small-slope approximation (SSA-II) with tapered wave incidence for reducing the edge effect caused by the limited surface size. The emphasis of this study is on the examination of the effect of ship-induce wake on backscattering scattering signatures of rough sea surfaces, due to the presence of ship-induced wake can significantly change sea surface's geometric structures especially for low wind conditions. Numerical simulations also show that the scattering signatures in the presence of a ship-induced wake significantly differ from those without wake, which is of great importance for the detection of ships in marine environment.
本文利用二阶小斜率近似(SSA-II)的极化散射模型,研究了船舶诱导开尔文尾流在粗糙海面上的电磁散射问题,该模型采用锥形波入射来减小由于表面尺寸有限而引起的边缘效应。本研究的重点是检验船舶诱导尾流对粗糙海面后向散射的影响,由于船舶诱导尾流的存在可以显著改变海面的几何结构,特别是在低风条件下。数值模拟还表明,船舶尾流存在时的散射特征与无尾流存在时的散射特征有显著差异,这对海洋环境中船舶的探测具有重要意义。
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引用次数: 0
The X-band microstrip filter design x波段微带滤波器设计
Huiwen Xu, Weixing Sheng
A fifth-order hairpin filter and a seventh-order hairpin filter are designed in this paper. The center frequency is 10.2GHz and the bandwidth is 1.9GHz. For the fifth-order hairpin filter, quarter-wavelength open-circuit stubs are added in the tapped lines to inhibit the 2nd harmonic. A microstrip line is added between the non-adjacent resonators to improve the selectivity of the filter. Progressive tapped lines avoid the mismatch of joints. As for the second and the fourth resonance units, their self-coupling spacing is widened to increase the frequency distance between their transmission poles and the rest units' transmission poles. As a result, the possibility of achieving wider bandwidth is raised. The insertion loss and the return loss are better than 1.39dB and 19.26dB, respectively. 19.76dB suppression within 6–8.85GHz and 40.40dB within 12–14GHz are achieved. 40dB suppression of 2nd harmonic(2f0) and 20dB suppression up to 2.4f0 are obtained as well. The seventh-order hairpin filter is designed by changing the parameters of the symmetrical resonators and coupling different resonators. It has been proved in this paper that coupling different resonators can be an easier way to acquire good performance in the target frequency band, compared with coupling the same resonators. The simulation results show that the insertion loss and the return loss are better than 1.48dB and 18.12dB, respectively. The suppression within 6–8GHz and 12–17GHz are greater than 50dB. 16.8dB suppression up to 2.4f0 are obtained. Compared with the filter in [5], two filters in this article acquire better suppression at about 2GHz away from the center frequency.
本文设计了一个五阶发夹滤波器和一个七阶发夹滤波器。中心频率为10.2GHz,带宽为1.9GHz。对于五阶发夹滤波器,在抽头线中加入四分之一波长的开路存根来抑制二次谐波。在非相邻谐振器之间增加微带线以提高滤波器的选择性。渐进式丝线避免了接头的不匹配。对于第二和第四共振单元,拓宽其自耦合间距,增加其传输极与其余单元传输极之间的频率距离。因此,提高了实现更宽带宽的可能性。插入损耗优于1.39dB,回波损耗优于19.26dB。在6-8.85GHz范围内实现19.76dB的抑制,在12-14GHz范围内实现40.40dB的抑制。对二次谐波(2f0)的抑制为40dB,对2.4f0的抑制为20dB。通过改变对称谐振器的参数,耦合不同谐振器,设计了七阶发夹滤波器。本文证明了不同谐振器的耦合比相同谐振器的耦合更容易在目标频段获得良好的性能。仿真结果表明,插入损耗和回波损耗分别优于1.48dB和18.12dB。在6-8GHz和12-17GHz范围内抑制大于50dB。可获得高达2.4f0的16.8dB抑制。与[5]中的滤波器相比,本文中的两个滤波器在距离中心频率约2GHz处获得了更好的抑制。
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引用次数: 6
Massive MIMO channel modeling using map-based ray tracing method 基于贴图的光线追踪方法的大规模MIMO通道建模
Junliang Yao, Haipeng Ren, Qing Liu
Massive multiple-input multiple-output (MIMO), with giant array size and multi-dimension array structure, has been widely considered as a key physical layer technique in future wireless communications. With regarding the large number of antenna elements, some new challenges and issues are arising, e.g. modeling the near-field effects in MIMO channel and the high computational complexity. To solve these problems, a statistical channel model is proposed based on the cluster delay line (CDL) framework. The proposed model focuses on the spherical wavefront theory, thus can be applied to the massive MIMO system. Furthermore, the map-based ray tracing algorithm with low complexity is used to compute the statistical parameters, such as pathloss, delay spread, etc., The numerical analysis results show that the proposed channel model is enable to describe the main characteristics of massive MIMO channel.
大规模多输入多输出(MIMO)以其巨大的阵列尺寸和多维阵列结构被广泛认为是未来无线通信的关键物理层技术。随着天线单元数量的增多,MIMO信道中近场效应的建模和计算复杂度等问题也随之产生。为了解决这些问题,提出了一种基于集群延迟线(CDL)框架的统计信道模型。该模型以球面波前理论为核心,可应用于大规模MIMO系统。在此基础上,采用复杂度较低的基于映射的光线追踪算法对信道的路径损失、时延扩展等统计参数进行了计算。数值分析结果表明,所提出的信道模型能够较好地描述大规模MIMO信道的主要特性。
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引用次数: 6
Design of big data processing system for spacecraft testing experiment 航天器测试实验大数据处理系统设计
Bo Sun, Lei Zhang, Y. Chen
The ground and in-orbit testing experiment of spacecraft are of great significance to the development of China's space industry, and processing the data of testing experiment is an indispensable part in it. In order to solve the problem of large data volume, complex data structure and long time needed for analysis in the testing experiment of spacecraft, a big data processing system of testing experiment is designed based on the mainstream big data processing technology. It stores the test data in the distributed file system of the computer cluster, and uses the memory computing technology to realize parallel processing of the experimental data. This system can greatly reduce the time needed to process experimental data, improve the efficiency of the spacecraft testing experiment, and has a good application prospect in the field of spacecraft test.
航天器的地面和在轨测试实验对中国航天事业的发展具有重要意义,而测试实验数据的处理是其中不可缺少的一部分。为解决航天器测试实验中数据量大、数据结构复杂、分析时间长等问题,基于主流大数据处理技术,设计了测试实验大数据处理系统。它将实验数据存储在计算机集群的分布式文件系统中,并利用内存计算技术实现实验数据的并行处理。该系统可大大缩短实验数据处理时间,提高航天器测试实验效率,在航天器测试领域具有良好的应用前景。
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引用次数: 2
Multicarrier transmission design for wireless communication in smart grid 智能电网无线通信的多载波传输设计
Lei Wei, Wei Li, Guzheng Qin, Wei Xu, Hua Zhang
Smart grid is the future development direction of power system, but it is difficult for the traditional data radio station to meet the new business needs. In this study, a wireless communication system combining the latest multicarrier communication technology is designed to improve the transmission rate and system reliability to realize information and interaction of smart grid. The system first respectively optimizes the signals in OFDM and GFDM by windowing and filter banks according to the characteristics of 230MHz channel, so as to realize the suppression of adjacent channel interference at the transmitter. On the other hand, in order to better adapt to the change of the channel conditions, we introduce the adaptive modulation and coding scheme (AMC). Turbo code is used and the transmission efficiency of different modulation and coding schemes is obtained by simulation. Using the Okamura-Hata model for the 230MHz band, we obtain the coverage of the cell and the corresponding system performance with different coding rates and scenarios.
智能电网是电力系统未来的发展方向,但传统的数据无线电台已难以满足新的业务需求。本研究结合最新的多载波通信技术,设计了一种无线通信系统,以提高传输速率和系统可靠性,实现智能电网的信息和交互。该系统首先根据230MHz信道的特点,通过加窗组和滤波组分别对OFDM和GFDM中的信号进行优化,从而实现对发射机相邻信道干扰的抑制。另一方面,为了更好地适应信道条件的变化,引入了自适应调制编码方案(AMC)。采用Turbo码,通过仿真得到了不同调制和编码方案的传输效率。采用Okamura-Hata模型对230MHz频段进行了计算,得到了不同编码速率和场景下小区的覆盖范围和相应的系统性能。
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引用次数: 1
Electric field uniformity of cabin containing apertures under low level swept fields 低水平扫掠场下带孔舱室电场均匀性研究
Zhao Pei, D. Su, Guochang Shi, Yi Liao
Low Level Swept Fields (LLSF) testing is an important part of the aircraft-level high intensity radiated fields (HIRF) effect measurements. According to the field uniformity requirement of the LLSF test in the non-enclosed aircraft cabin, the model of scaled aircraft cabin with mode stirrer placed internally is established. The field strength distribution inside the cabin exposed to the low level swept fields is analyzed by using numerical methods, for each step of mode stirrer. Based on the principle of reverberation chamber, the characteristics of electric field uniformity at different frequencies is obtained, including the relationship between the uniform volume and the frequency. It provides an important reference for limiting the distance between the stirrer and the receiving antenna for practical LLSF measurements.
低水平扫描场(LLSF)测试是飞机级高强度辐射场(HIRF)效应测试的重要组成部分。根据非封闭式飞机客舱LLSF试验的场均匀性要求,建立了内置模态搅拌器的飞机客舱比例模型。采用数值方法分析了低水平扫掠场作用下模态搅拌器各步的舱内场强分布。根据混响室原理,得到了不同频率下电场均匀性的特性,包括均匀体积与频率的关系。为实际测量中限制搅拌器与接收天线之间的距离提供了重要参考。
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引用次数: 0
Reduced side lobe level of sparse linear antenna array by optimized spacing and excitation amplitude using particle swarm optimization 利用粒子群算法优化空间和激励幅值,降低稀疏线性天线阵列旁瓣电平
N. Ullah, Zhao Huiling, Tariq Rahim, Saeed Ur Rahman, Mian MuhammadKamal
Sparse antenna array has many advantages like low mutual coupling, directive beam and cost effective because of less number of elements as compare to equally spaced antenna array. While the main limitation in this array is of high side lobe levels because of different inter element spacing. In this paper optimized values of elements spacing and excitation amplitude for sparse linear antenna array are achieved to minimize the peak side lobe level using particle swarm optimization (PSO) with better convergence rate. Random values of spacing are considered in half and one wave length range. And maintained the main beam direction.
与等间距天线阵相比,稀疏天线阵具有互耦性低、波束方向性好、单元数量少等优点。但由于元件间距不同,该阵列的主要限制是旁瓣电平过高。本文利用粒子群优化算法(particle swarm optimization, PSO)实现了稀疏线性天线阵列中单元间距和激励幅值的优化,使天线阵的峰值旁瓣电平最小,收敛速度更快。在半波长和一个波长范围内考虑间隔的随机值。并保持了主波束方向。
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引用次数: 6
Research on improved algorithm for traffic information prediction 交通信息预测改进算法研究
Dakai Yang, Li Wang, Jian Wang, Cai Baigen
Predictions for traffic conditions, especially short-term prediction, is one of the central topics in traffic information simulation and controlling relevant research and practice. However, it is not easy to select the most appropriate traffic prediction method for one particular application. In this paper we select two typical methods in this field, then compared about the advantages and disadvantages. Based on this, we provide an improved algorithm to combine the advantages of these methods. To prove the effects, some real data were adopted for the calculation and simulation which were also shown in this paper.
交通状况预测,特别是短期预测,是交通信息仿真与控制相关研究与实践的中心课题之一。然而,为某一特定应用选择最合适的流量预测方法并不容易。本文选取了该领域两种典型的方法,并对其优缺点进行了比较。在此基础上,我们提出了一种改进的算法来结合这些方法的优点。为了证明该方法的效果,本文还采用了一些实际数据进行了计算和仿真。
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引用次数: 0
期刊
2017 7th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE)
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